Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble reading the sensor that tells it how much fluid is in a certain tank, like the windshield wiper fluid tank.
The B0120 code is triggered when there is an issue with the fluid reservoir level sensor, which monitors the fluid level in reservoirs like the windshield washer fluid tank.
The B0120 code indicates a malfunction in the fluid reservoir level sensor circuit. This sensor is responsible for detecting the level of fluid in a particular reservoir, such as the windshield washer fluid or coolant reservoir. A fault in this sensor can lead to incorrect readings being sent to the vehicle's control module.
• Warning light on the dashboard
• Inaccurate fluid level readings
• No warning when fluid is low
• Faulty fluid level sensor
• Damaged wiring or connectors
• Faulty control module
Sensor: A device that detects or measures a physical property and records, indicates, or otherwise responds to it.
Reservoir: A large natural or artificial lake used as a source of water supply.
• Check the fluid level sensor for damage.
• Inspect wiring and connectors for any signs of damage or corrosion.
• Test the sensor with a multimeter to ensure it's functioning properly.
• Replace the faulty fluid level sensor.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the control module if necessary.
• Multimeter
• Screwdriver set
• OBD-II scanner
$100 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly check fluid levels.
• Inspect sensor wiring for damage.
• Ensure connectors are clean and secure.
Sensor Issue
• Check fluid levels regularly to avoid triggering the code.
• Have the sensor checked if the warning light appears.
Check with your vehicle manufacturer for specific warranty coverage related to sensors.
This code has been associated with fluid level sensor issues in various vehicle models and can often be resolved with sensor replacement.
Low – This issue does not typically affect vehicle performance but should be addressed to ensure accurate fluid level monitoring.
Ignoring this code may lead to running out of essential fluids, which could result in safety issues.
• Vehicle is on a flat surface.
• All fluids are at normal operating levels.
The fluid reservoir level sensor is typically located in or near the fluid reservoir it monitors, such as the windshield washer fluid tank.
Q: Can I drive with a B0120 code?
A: Yes, but it's best to fix the issue to ensure accurate fluid level readings.
Q: How do I reset the B0120 code?
A: Fix the issue and use an OBD-II scanner to clear the code.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Body and airbag faults often need a scanner that can access more than generic powertrain codes.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking power, ground, and continuity in body-system circuits.
View on Amazon
Universal · Fuse kit
Useful for electrical diagnosis when blown fuses or circuit faults are part of the troubleshooting process.
Useful when body electrical faults trace back to blown fuses or shared circuits.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.